Investigations of the semiconductor properties of anodically formed passive layers on Zn and of ZnO single crystals in different aqueous electrolytes by EIS

Environmentally safe corrosion inhibition of the Cu–Ni alloys in acidic sulfate solutions

“…Equivalent circuit used in the fitting of the impedance data of Cu-Ni alloys at different conditions, R W = solution resistance, R p = polarization resistance, C = electrode capacitance, R ad = adsorbed layer resistance, C ad = adsorbed layer capacitance, and Z w = Warburg impedance. [18,29,32]. The values of R ad and 1/C ad for Cu-65Ni are remarkably higher than those for Cu-5Ni in the same solution.…”

Comparative study on the electrochemical performance of the Cu–30Ni and Cu–20Zn–10Ni alloys

“…The above relation is known as the dispersion formula and it takes into account the deviation from the ideal RCbehavior in terms of a distribution of time constants due to surface inhomogeneity, roughness, adsorption of inhibitors, formation of porous layers, and variation in properties or compositions of surface layers [24][25][26][27]. Here n can be used as a measure of the surface inhomogeneity.…”

Environmentally safe corrosion inhibition of Pb in aqueous solutions

“…The impedance data were analyzed using software provided with the electrochemical workstation, where the dispersion formula was used. In this formula an empirical factor α (0 ≤ α ≤ 1) is introduced to account for the deviation from the ideal capacitive behavior due to surface inhomogeneties, roughness factors and adsorption effects [26][27][28][29]. The experimental values are correlated to the simple equivalent circuit model (Randles model) presented in Fig.…”

“…Bode plots are recommended as standard impedance plots, since all experimental impedance data are equally represented and the phase angle, as a sensitive parameter to interfacial phenomena, appears explicitly [25,26]. The phase maximum at the intermediate frequencies broadens in the presence of the amino acid, which indicates the presence of passivation phenomenon [29]. The impedance data were analyzed using software provided with the electrochemical workstation, where the dispersion formula was used.…”